Private server SQL error aftet importing Struct.sql

hey guys if i try to register an account on my own pserver the server.exe give's me error "System.Data.SqlTypes.SqlnullValueException: data is Null.
This Method or Property Cannot be Called on 0 Values.

you're using mysql workbench arent you. use xampp and run the sql query on the phpmyadmin database named rotmg. if none is there called rotmg make a new one.